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Finding the Fourth Proportional to 355.03, 489.95 and 197.68

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Solution

The fourth proportional to 355.03, 489.95 and 197.68 is: 272.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.03 : 489.95 = 197.68 : x
  2. Step 2: Convert to fraction form
    355.03/489.95 = 197.68/x
  3. Step 3: Cross multiply
    355.03x = 489.95 × 197.68
  4. Step 4: Simplify right side
    355.03x = 96,853.32
  5. Step 5: Solve for x
    x = 96,853.32/355.03
  6. Step 6: Final answer
    x = 272.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.